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Characters for volumes I and II (上 and 下) of "New Intermediate Chinese Dialogues" by the Taipei Language Institute (TLI).
You can study the vocabulary of the two volumes here:
http://legacy.skritter.com/vocab/list?list=564352896
Thanks to mjroma at Pleco Forums for these lists:
http://www.plecoforums.com/threads/new-intermediate-chinese-dialogues-tli.4913/
New Intermediate Chinese Dialogues. ©2009 Taipei Language Institute Press. All rights reserved.
http://www.tli.com.tw/en/course/tli_textbooks.aspx